Solar panels can be a handy way to get a little extra juice, particularly if you're out camping or away from an outlet. These mini solar panels fold up into a stack the size of a deck of cards, but contain 12 panels capable of charging a cellphone.

These won't be able to power your whole house or anything, but at less than $1.50 for each panel in the stack, they're still pretty impressive—and you can add more if you want to charge something larger (or faster).

You can find the build guide is on GitHub and Instructables. The panels themselves are each capable of providing between 0 - 0.5V at 400 - 1000mA (or 1A), depending on the sunlight available. The panels even have thin neodymium magnets that let them stick to each other as they're laid out side-by-side. The guide itself is pretty simple and straightforward; complete with easy to understand illustrations for each step provided you have a bit of DIY experience.

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The materials needed include a polycarbonate sheet, some EVA film, some copper tape with conductive adhesive, some small neodymium magnets, and the solar cells themselves. Don't worry if you have no idea where to get that stuff; there are links to all the places to get them on the materials list. Check out the links below to see the project in full.